Island



(No Model.)

H. B. WHITAKER.

01301111? CLOSER.

No. 427.024. Patented Apr. 29, 1890.

I forth.

UNITED STATES PATENT OFFICE.

HENRY BURNSIDE IVHITAKER, OF RIVER POINT, RHODE ISLAND, ASSIGNOR OFONE-THIRD TO JAMES A. MATTESON, OF SAME PLACE.

CLOSER.

SPECIFIGATION forming part of Letters Patent No. 427,024, dated April29, 1890.

Application filed February 1, 1890.

To all whom it may concern.-

' Be it known that I, HENRY BURNsIDE WHITAKER, a citizen of the UnitedStates, residing at River Point, in the county of Kent and State ofRhode Island, have invented certain new and useful Improvements inCircuit-Closers for'Electric Bells and other Uses; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to circuit-closers for electric bells and otherpurposes; and it consists in an improved construction, as hereinafterdescribed and claimed.

In the accompanying drawings, Figure 1 represents a plan view of acircuitrcloserprovided with myimprovement. Fig. 2 is a vertical sectiontaken on line 00 a; of Fig. 1.

A designates a circular block or casing constructed of suitablematerial, in which are mounted two insulated studs or screws a, withwhich, severally, the conducting-wires c are connected, as shown. Fromthe center of the block A extends a vertical fixed bolt 6, the upperpart of which is threaded for connection with a turn-button, ashereinafter set B indicates acap or cover which is mounted on the blockA, and is provided with a central aperture, through which the bolt 6extends. The said cap is constructed of suitable metal, and rests on theblock A with its edge in contact therewith, the main part of the capbein g held somewhat above the studs or screws a. A threaded turn-buttonO is placed on Serial No. 338,928. (No model.)

the upper end of the bolt 6, and may be screwed down against the cap B,which is sufficiently flexible and elastic to yield to the 40 pressureof the button when the latter is turned by hand. The studs a form thestationary contact-points, the' elastic cap form'- ing a spring-contact,and the operator closes the circuitby turning the button 0, compressingthe cap so that it is brought in contact with the studs a, thus closingthe circuit. The turn-button being released, the cap springs fromcontact with the studs and turns the button back slightly, thus breakingthe 5:)

circuit.

I claim- 1. In a circuit-closer, the combination, with two stationarycontact-points, of an elastic metal cap placed over said contact-points,a screw, and a turn-button which is in connection with said screw, andis adapted to press said elastic cap in contact with said stationarypoints, substantially as and for the purposes described.

2. The combination, with a base and two stationary contact-points, of avertical screwbolt, an elastic cap B, and a turn-button on saidscrew-bolt, said cap being in position to be compressed by a turningmovement of the button, substantially as and for the purposes described.

In testimony whereof I have affixed my signature in presence of twowitnesses.

HENRY BURNSIDE WHITAKER.

IVitnesses:

JAMES A. MArrEsoN, A. O. WALKER.

